Abstract: In a system composed of at least two components joined by a common DC bus, a method to regulate the common DC bus and share the regulation of the DC bus between two or more elements connected to the DC bus through power converters by: implementing a first controller on each converter to introduce a virtual resistance or droop at the terminals of the converter that are connected to the bus being regulated; and implementing a second controller to regulate a second variable different from the common DC bus voltage where the output of the controller is used to shift the virtual resistance curve up and down.

Abstract: A method includes the steps of providing a common DC bus to interconnect power elements to a DC distribution system using power converters. A first group of one or more of the elements (main element) is used to execute the primary function by automatically maintaining the DC bus voltage following a set point. The DC bus voltage set point is intentionally changed with slow dynamics according to a secondary function executed by the main element such that the average DC bus voltage regulated by the main element changes. A local logic is used on each of the power elements connected to the DC bus but different from the main element to modify their power generation or consumption as a result of changes in the measured average DC bus voltage such that they contribute to the fulfillment of the secondary level of control.

Abstract: A method for transferring power between two DC circuits, each circuit being bipolar or connected at the midpoint thereof, involves: coupling the high voltage bus across a pair of inductors, arranged in parallel; coupling the low voltage bus across the pair of inductors; coupling the high voltage bus, the low voltage bus and the inductors by active switches and diodes, to provide for: (i) a storage configuration, wherein energy is transferred from one of the buses and stored in the inductors; and (ii) a release configuration, wherein energy is released from the inductors and transferred to the other of the buses.

Abstract: An improved method for controlling an electrical distribution system of the type having a plurality of electrical sources, a load, a DC link coupling the electrical sources to the load and a control means for controlling the output of at least one of the plurality of electrical sources so that the plurality of sources deliver to the load an amount of power appropriate to the load. The improvement comprises an adaptation in respect of the load that provides for the DC link voltage to vary; and an adaptation of the control means resulting in the output being controlled as a direct function of the DC link voltage.

Abstract: A method for transferring power between two DC circuits, each circuit being bipolar or connected at the midpoint thereof, involves: coupling the high voltage bus across a pair of inductors, arranged in parallel; coupling the low voltage bus across the pair of inductors; coupling the high voltage bus, the low voltage bus and the inductors by active switches and diodes, to provide for: (i) a storage configuration, wherein energy is transferred from one of the buses and stored in the inductors; and (ii) a release configuration, wherein energy is released from the inductors and transferred to the other of the buses.